> ## Documentation Index
> Fetch the complete documentation index at: https://docs.theblockchainlibrary.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Double Signing

> A proof-of-stake violation where a validator signs conflicting blocks or votes for the same consensus height or slot.

# Double Signing

A proof-of-stake violation where a validator signs conflicting blocks or votes for the same consensus height or slot.

## Definition

A proof-of-stake violation where a validator signs conflicting blocks or votes for the same consensus height or slot.

## Why it matters

Security concepts help users and developers recognize common blockchain attack surfaces and defenses.

## Related knowledge

* [Phishing](/generated/v2/glossary/phishing) — term
* [Smart Contract Audit](/generated/v2/glossary/smart-contract-audit) — term
* [Sybil Attack](/generated/v2/glossary/sybil-attack) — term

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**Canonical knowledge ID:** `glossary:double-signing`